Staples offers the Oral-B Professional Care SmartSeries 4000 Electric Toothbrush 2-Pack, model no. D26-526-4, for $89.99. Apply coupon code "76802" to cut the price to $71.99. With free shipping, that's $18 below our April mention and the best price we've seen. (It's a current low by $21.) It features a pressure sensor (to signal when you're brushing too hard), timer, four brushing modes, two brush heads, and in-handle display.